JPH07230070A - Liquid crystal projector - Google Patents

Abstract

PURPOSE:To easily attach a liquid crystal projector used for both front surface projection and back surface projection to a housing in the case of using as the projector for the back surface projection. CONSTITUTION:An aperture part 4 is provided on the side surface of the housing 1 and a box body 3 on which a liquid crystal projector main body 5 is mounted is inserted in a drawer state from the aperture part 4. A lens mounting part is positioned in front of the projection lens 6 of the main body 5, and the deficit of enlargement ratio in the case of using a zoom lens for the projection lens 6 is compensated by mounting an enlargement lens on the lens mounting part. Picture light from the projection lens 6 is reflected by mirrors 7 and 8, and is projected on a transmission type screen 2 disposed in front of the housing from a back surface; so that a picture is displayed. The box body 3 is drawn from the housing 1 in the case of using the projector for the front surface projection, the enlargement lens is removed, the mirror 7 is removed; so that the main body 5 can be used while being mounted inside the box body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device using a liquid crystal panel, and more particularly to a liquid crystal projector main body for both rear projection type and front projection type.

[0002]

2. Description of the Related Art There is a projector apparatus using a liquid crystal panel or the like, in which the projector main body can be used for both front projection type and rear projection type. This is because, for example, when installing in a limited space, you want to mount the projector body inside the housing and use a rear projection type so that the depth is short for a large screen and you want to project on a large screen in a wide space. In this case, the front projection type is used to project from an appropriate position on the screen so that it can be used properly according to the purpose.

When the liquid crystal projector main body is used for front projection, the image size is adjusted according to the distance from the projector main body to the screen or the screen size by adjusting the zoom lens or the like, and the operation of focusing is performed. Therefore, it is only necessary to make these adjustments while looking at the image on the screen, but when using the rear projection type, make sure that the projector main unit is accurately adjusted so that a normal image is projected on the screen on the front of the chassis. It is necessary to mount the mirror at a position, and the mirror disposed between the liquid crystal projector main body and the screen is required to have high accuracy in the installation angle. For this reason, time and technique are required for mounting on the housing for rear projection use.

[0004]

SUMMARY OF THE INVENTION In consideration of the above-mentioned problems, the present invention makes it possible to easily mount the projector main body at a predetermined position when the rear projection type is used, and to perform complicated adjustment. To provide what you don't need.

[0005]

In order to solve the above-mentioned problems, the present invention provides a transmissive screen on the front surface of a housing,
In a device for displaying an image by projecting light from a liquid crystal projector main body mounted in a housing from the back side onto the screen, a lens mounting portion provided in front of a projection lens of the liquid crystal projector main body, in which a magnifying lens is mounted, Provided is a liquid crystal projector device comprising a box body placed at a predetermined position in the housing and mounted with a liquid crystal projector main body, and an opening provided in the housing for inserting the box body in a pull-out manner.

[0006]

With the above construction, in the liquid crystal projector device according to the present invention, the liquid crystal projector main body is mounted in the box body, and the box body is pulled out from the opening on the side of the box body into the box body. For example, since the box body is placed at a predetermined position by the positioning tool provided inside the housing, the image from the liquid crystal projector main body is projected at the correct position on the screen. A magnifying lens set for rear projection is mounted in front of the projection lens of the liquid crystal projector body, and the projection optical path is shortened to reduce the depth of the housing.
Further, when using two or more mirrors between the projection lens and the screen, the accuracy of the position of the image on the screen is improved by mounting the mirror arranged immediately in front of the liquid crystal projector main body inside the box body. be able to.

[0007]

Embodiments of the liquid crystal projector device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of a main part of an embodiment of a liquid crystal projector device according to the present invention, and is a diagram when a liquid crystal projector main body is used for rear projection. In the figure, 1 is a housing, 2 is a rear projection type transmission screen disposed on the front surface of the housing 1, 3 is a box body for pulling out the housing 1, and 4 is an opening for inserting and removing the box body 3. This is an example provided on the right side surface of the housing 1. 5
Is a liquid crystal projector main body, 6 is a projection lens for projecting the image light of the liquid crystal projector, 7 is a mirror arranged obliquely upward in front of the liquid crystal projector main body 5 for reflecting the image light from the projection lens 6, and 8 is Since the image light reflected by the mirror 7 is reflected toward the screen 2, the housing 1
Is a mirror arranged diagonally downward on the back surface of the. Reference numeral 9 denotes a notch provided on the front side of the box body 3 so as not to obstruct the optical path when the liquid crystal projector main body 5 is used in the front projection type.

FIG. 2 is a cross-sectional view of the main part including the box 3 and the liquid crystal projector main body 5 and the mirror 7 placed in the box 3, as seen from the front of the case 1. Casters 11 are attached to the lower surface of the box body 3 to facilitate the insertion and removal of the box body 3 in the direction of arrow a. Reference numeral 12 is a handle used when pulling out the box body 3, and 13 is a positioning tool provided on the bottom surface of the housing 1 for positioning the box body 3. Reference numeral 14 is a mounting tool for the mirror 7, and when the liquid crystal projector body 5 is used for rear projection, the mirror 7 can be mounted in a correct position by mounting it here.

FIG. 3 is a side view of the liquid crystal projector main body 5, showing a state in which a magnifying lens 21 is mounted in front of the projection lens 6.

When the liquid crystal projector main body 5 is used as a rear projection type, the box body 3 in which the liquid crystal projector main body 5 and the mirror 7 are mounted is inserted into the housing 1 through the opening 4. The box body 3 is smoothly inserted by the rotation of the casters 11 attached to the bottom surface, and is mounted in the correct position by the positioning tool 13 or the like. A magnifying lens 31 provided for rear projection is mounted in front of the projection lens 6 of the liquid crystal projector body 5. This is because a zoom lens is used as the projection lens 6 for the convenience of using the liquid crystal projector main body 5 in the front projection type, and when used in the rear projection type, the zoom lens is changed to a screen size without replacement. It is attached to increase the magnification of the zoom lens in order to obtain a corresponding image size. Alternatively, even when a fixed focus lens is used as the projection lens 6, the projection lens 6 is similarly mounted when it is necessary to increase the magnification of the projection lens 6 in order to correspond to the screen size.

The image light from the liquid crystal projector body 5 is
The light is emitted through the projection lens 6 and the magnifying lens 31, is reflected by the front mirror 7 and the rear mirror 8 of the housing, and is projected on the screen 2. By mounting the liquid crystal projector main body 5 and the mirror 7 at a predetermined position on the box body 3, and inserting the box body 3 at a predetermined position in the housing 1, the image light passes through a predetermined optical path. Alternatively, the focus of the image is not disturbed. Although this example uses two mirrors, only the liquid crystal projector main body 5 is attached to the box body 3 in the case where the mirror 7 is not used. In this case, the liquid crystal projector main body 5 is mounted in a direction different from that shown in FIG.

When the liquid crystal projector main body 5 is used for front projection, the box body 3 is pulled out from the housing 1, the mirror 7 is removed, and the magnifying lens 21 is removed as needed. Since the front side of the box body 3 has a notch 9 in a portion corresponding to the image light path from the projection lens 6, the image light path is not obstructed even if it is not taken out from the box body 3, and the liquid crystal projector main body 5 is attached to the box body 3. You can project as is. If used in this way, the box 3
It is possible to save the troublesome work for setting inside. Further, by pulling out the box body 3 to a position where the projection lens 6 goes out of the housing and removing the mirror 7, it is possible to project on the screen installed on the opposite side of the housing 1. The liquid crystal projector main body 5 may be detached from the box body 3 and used.

[0013]

As described above, according to the liquid crystal projector device of the present invention, when the rear projection type is used,
The liquid crystal projector main body is mounted in a regular position inside the housing by simply mounting the liquid crystal projector main body at a predetermined position on the housing and inserting this housing into the opening of the housing. It does not. When using this LCD projector body for front projection, pulling the box out of the housing and removing the mirror inside the box allows the LCD projector body to be used with the box still attached. It does not require any special settings. Also, since a magnifying lens is attached in front of the projection lens, if a zoom lens is used as the projection lens, an image of an appropriate size can be projected on the screen by utilizing the characteristics of the zoom lens when used in front projection. When used in rear projection, both conditions of using rear projection and using front projection can be satisfied by adding a magnifying lens to compensate for the lack of magnification of the zoom lens.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of a liquid crystal projector device according to the present invention.

FIG. 2 is a cross-sectional view of a main part of an example of a box in which a liquid crystal projector body is mounted.

FIG. 3 is a diagram illustrating how a magnifying lens is attached to a liquid crystal projector main body.

[Explanation of symbols]

 1 Housing 2 Screen 3 Draw-out Box 4 Housing Opening 5 Liquid Crystal Projector Main Body 6 Projection Lens 7 Mirror 8 Mirror 9 Cutout 11 Castor 13 Positioning Tool 21 Magnifying Lens

Claims (5)

[Claims] 1. A liquid crystal projector main body, wherein a transmissive screen is provided on the front surface of the housing, and light from a liquid crystal projector main body mounted inside the housing is projected from the rear surface onto the screen to display an image. A lens mounting part provided in front of the lens, to which a magnifying lens is mounted, a box body mounted at a predetermined position in the housing and mounted with a liquid crystal projector main body, and provided on the housing for inserting the box body in a pull-out manner Liquid crystal projector device composed of an opening. 2. A transmissive screen is arranged on the front surface of the housing, and light from a liquid crystal projector main body mounted inside the housing is projected from the back surface onto the screen through at least two mirrors to display an image. A lens mounting portion provided in front of the projection lens of the liquid crystal projector body, in which a magnifying lens is mounted, and a liquid crystal projector body placed at a predetermined position in the housing and a mirror disposed immediately in front of the liquid crystal projector body. A liquid crystal projector device comprising: a box in which a box is mounted and an opening provided in a box for inserting the box in a pull-out manner. 3. The liquid crystal projector device according to claim 1, wherein a mounting position locating tool for the box body is provided on a bottom surface portion of the housing. 4. The front portion of the box body is provided with a notch in a portion corresponding to an optical path from the liquid crystal projector main body.
Alternatively, the liquid crystal projector device according to claim 2. 5. The liquid crystal projector device according to claim 1, wherein casters are attached to the bottom surface of the box body.